vb.net - .NET and ServicePointManager.SecurityProtocol -


i'm using webclient class in .net , went download site. 

dim owebclient new webclient() dim odownloadedpage string = owebclient.downloadstring(<site>)

it tossed authentication error after little searching turned out site trying download must of disabled tls1.0

so changed servicepointmanger this

servicepointmanager.securityprotocol = securityprotocoltype.ssl3 or     securityprotocoltype.tls12 or securityprotocoltype.tls11 or securityprotocoltype.tls

i got same error.. decided change this.. 

servicepointmanager.securityprotocol = securityprotocoltype.ssl3 or     securityprotocoltype.tls or securityprotocoltype.tls11 or securityprotocoltype.tls12

see did there? switched order , worked.

can explain me difference in ordering? , why matters? i'm wondering if go download tls 1.0 site, if fail.


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